<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Title</title>
<style type="text/css">
</style>
</head>
<body>
</body>
<script >
//let声明的变量，是块级作用域；不能重复声明！
// {
//// let a = 12;
// let a = 12;
// let a = 13;
// }
// console.log(a)
var a = [];
// let a = [];
for(var i =0;i<10;i++){
a[i] = function(){
console.log(i)
}
}
a[6]();//6 还是10？
//不存在变量提升；
// var foo = 2
console.log(foo);//undefined
var foo = 2;
//const声明变量，一旦声明，立即初始化，不能重复声明！
</script>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>02-模板字符串</title>
<style type="text/css">
</style>
</head>
<body>
</body>
<script>
//拼接字符串和变量
var a = 26;
var b = 22;
//字符串的拼接；
// var str = "崔晓昭" + a + "李静瓶" + b;
//使用反引号；
var str = `崔晓昭${a}李静瓶${b}`;
console.log(str);
</script>
</html>